How to implement a caching server?

Question

Cisco

I work for a provider. There is a tsiska, shaper, bgp - server. Somewhere between them, you need to put a server that caches information at the request of the user. Questions between whom and whom to put it? I will also be grateful for articles on this topic. Didn't find anything on google.

Answer 1

Do you want to let everyone through the proxy or not?
habrahabr.ru/post/194054 - it seems to me the closest to you.
Yes, the gain will be small.

Answer 2

between the router that gives the connection to users